ProTaper MX RS (Race Spec) rear sprockets are the ultimate choice for motocross performance. Constructed from 7075 T-6 heat-treated aluminum, these sprockets are precision CNC-machined to the strictest quality standards. They feature a proprietary mud groove design that results in 44 percent more tooth surface area, which dramatically increases sprocket life. Their deep-penetrating anodized finish is durable and looks great, too! The number of teeth is laser-etched onto each MX RS sprocket for easy identification. Outlast the competition with ProTaper MX RS (Race Spec) rear sprockets! PB105 Please confirm fitment before ordering. Let me know if you have any questions! Thanks for shopping!